chore(cuopt): remove orphaned pre-consolidation API skills

cuopt-numerical-optimization-api-c and -cli were consolidated into
cuopt-numerical-optimization-api upstream (NVIDIA/cuopt#1489) and
delisted from components.d/cuopt.yml in #316. The sync deletes only
within managed catalog_dirs, so these de-listed dirs lingered as
orphans. Remove them.

Note: -python is intentionally left; it is still referenced by the
nvidia-skills plugin bundle and needs a coordinated bundle swap to the
consolidated skill first.

Signed-off-by: Moshe Abramovitch <moshea@nvidia.com>

Author: mosheabr